[gtk] overlay: Remove no-longer-existing api from header

[Matthias Clasen <matthiasc src gnome org>]

commit f20f02c4161059ab7474f1eaa925b48e6d9b2ca5
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Mar 28 18:27:25 2019 -0400

    overlay: Remove no-longer-existing api from header

 gtk/gtkoverlay.h | 7 -------
 1 file changed, 7 deletions(-)
---
diff --git a/gtk/gtkoverlay.h b/gtk/gtkoverlay.h
index a4ac9480dd..a86f82480c 100644
--- a/gtk/gtkoverlay.h
+++ b/gtk/gtkoverlay.h
@@ -81,13 +81,6 @@ GDK_AVAILABLE_IN_ALL
 void       gtk_overlay_add_overlay (GtkOverlay *overlay,
                                     GtkWidget  *widget);
 GDK_AVAILABLE_IN_ALL
-gboolean   gtk_overlay_get_overlay_pass_through (GtkOverlay *overlay,
-                                                GtkWidget  *widget);
-GDK_AVAILABLE_IN_ALL
-void       gtk_overlay_set_overlay_pass_through (GtkOverlay *overlay,
-                                                GtkWidget  *widget,
-                                                gboolean    pass_through);
-GDK_AVAILABLE_IN_ALL
 gboolean   gtk_overlay_get_measure_overlay (GtkOverlay *overlay,
                                            GtkWidget  *widget);
 GDK_AVAILABLE_IN_ALL